-I like the way the campaign pic looks, but I feel that some of them (mutation, versus, realism, realism versus, etc) could use some improvement, like something more... versusy... for the versus pic :P (-2)
-The background looks a little stretched, I'm not sure if that's just the preview pic, though. Also, the "Rinbow Dash" text should be moved do it won't be covered by the menu. (-1)

Conclusion:

Good job! At first glance, the overall appearance of this mod is great. The only thing I would look for some fixes for my cons, they should be fairly simple, and in my opinion they're necessary for use.